What is a proper use for an ingress VLAN in an HP MSM VSC?

A.
To specify the VLAN on which APs forward traffic from clients connected to the VSC

B.
To enable controlled MSM APs to tunnel wireless guest traffic successfully

C.
To map traffic from wired guest clients to an access-controlled VSC

D.
To specify the VLAN on which the controller forwards traffic from clients connected to the VSC